Awesome progress dude. You’ve got some real nice range of motion and deformation on the arms. There were a few points where the deformation of the muscles could use a bit of work- the butt muscle moved inward just a little too much when the leg was brought forward, and there was quite a big crease on the front of the hip too. Calf muscles did seem to noticeably change volume a bit too much. Overall it’s all looking great though.
One thing you should probably do a little more often in the demo video is blend on/off the effect of the muscles so that a potential employer could actually see the effect of the muscle system compared to just plain skinning.
The UI is awesome- animators love that kind of thing. Just make sure that it’s really obvious to the end user how to use it. That big block of blue buttons might be kind of confusing to some users- particularly the hardcore animator types which aren’t always from a technical background. One more thing I would advise- make sure the UI can work with multiple characters in the scene! Message attributes are your friend here, and namespaces will become a necessary evil so you might as well embrace them.